Furnace



Sept. 25, 1928. 1,685,339

, O. W. RANDOLPH FURNACE Filed March 27, 1925 2 Sheets-Sheet 1 am MRMW INVENTEJ W ATTEITNET Sept. 25, 1928.

1,685,339 o. w. RANDOLPH FURNACE Y 2 \\u N a f ii WK r e L! Q I T m KN 2 E Mk. R M v A W N E 1 Y 9 \Q Mm NM E w m m m H w F 1% Patented Sept. 25, 1928.

(PATENT OFFICE;

OLIVER W. RANDOLPH, OF TOLEDO, OHIO.

FURNACE.

Application filed larch 27, 1985. Serial No. 18,736

This invention relates to heaters. This invention has utility when incorporated in warm air supply apparatus for delivering heated gases into a safetyduct or way.

Referring to the drawings:

Fig. 1 is a vertical section, with parts broken away, of an embodiment of the invention as a warm air supply, as for the operation of a drier in the removal of moisture from material, ascereals;

Fig. 2 is a sect-ion on the line IIII, Flg. 1, looking in the direction of the arrow;

Fig. 3 is. a section on the line In -III, Fig. 2, looking in the direction of the arrow;

Fig. 4 is a perspective v1ew of an air duct supply side delivery section as disposed under the fire door;

Fig. 5 is a perspective view'of an open top delivery duct section; t

Fig. 6 is a perspective .view of a fire pot side section;

Fig. 7 is a perspective view of a fire pot corner section;

Fig. 8 is a section of a' duct on the line VIIIVIII, Fig. 3;

Fig. 9 is a side elevat1on,w1th parts broken away, showing the assembly of the furnace as a hot air supply source for a column type of drier; and Y Fig. 10 is a perspective view of the-safety connection or louvre between the hot an. supply and such drier to preclude reverse draft or combustion gas flow contrary to draft promotion control. .0

Furnace housing 1 as herein shown may be 'of masonry, and is provided with a sh p1t 2 having ash door 3. BarsA embedded in the masonry of the furnace housmgl above .the ash pit 2 carry grate r1ng.5 hav ng hor zontally extending grate bars 6.- g p This grate rmg 5 has upwardly extending damper 30 16 rises adjacent openings 18 in duct 19 having its outer end 20 normally closed by damper 21 as gravity falling into closed pos1t1on 1n said duct.

Ad acent the fire door 11 and therebelow is duct section 22 provided with damper '23 similar to the damper 21.. This section 22' instead of having an upper outlet 18'has lateral openings 2fl in communication with adacent duct sections 19. Corner duct sections 25 have openings 26 similar to the openings 18'and adjzicent the fire pot section supportmg edge 1 There is, accordingly, provided herein a fire pot held rigid against outward shifting, but which fire pot may be readily removed for replacement as the sections deteriorate or warp in shape. upward removal of,the sections permit access to tllie duct sides for "cleaning as may be desire Above this fire pot 8 is combustion chamber 27 1n communlcation withvwhich is door 28 as a check draft. Above this combustion chamber 27 is a plurality of ducts 29 about which the products of combustion may ass n ascent to pass'b damper 30 into stac 31 as a normal take-o flue. As .the fire is started in th s heater or furnace, draft for combustlon 1s supplied by way of ash pit 3 for passing up through the grate. As the fire gets under way the increase in draft is suflicient to=-open t e'supplemental air duct dampers or valves 21, 23, and air from outside the furnace housing enters directly by wayofpassage 32 to rise around the fire pot 8, and thus passilfg iup around the fire t 8 enters the combustion chamber 27 an b may,fwi}fh ftihe open as wa o t e' no stack 31. P y y The air as coming into the ducts 29 passes to air duct 33'as warm air not contaminated therefrom fla i t rongs 7. Above any prqducts. of o bustion. This duct this grate there .is provideda fire pot 8 here--' 33, as hemm disclosed, is com I i to draftin shown-as comprismvside sections 9 and; corner sections 10 extending about the grate Way 85 to column drier36 down' throug f fire door llthrough which thesup o f l iz ird fuel may be' introduced mto this pot 8 over the grate. These fire -9, 10, are provided wlth lugs'12 extend brace bars 13-into the masonry 119118 Y ing 1 for maintaining these sections against spreading apart as the sections are slid into position over the heads of these brace bars 13 for having lower channel portions 14,-15, rest upon duct edges 16; 17. The duct edge sections; m which promotion means herein shown as fan 34 min which upwardly extends hot air's'uppl which the material as grain, coal, rock or other granular substanceto beacted u n, may pass 'from supply end or hopper? to :be delivered by way of discharge With the heater under operation it may be desirableto supplement the warm air as delivened' to the way 33, especially in those-instances wherein the of the products of combustion may not be detrimental to the Furthermore, the.

be heated by the sections 9,10. This air as combustion chamber 27 above the ducts 29.

' This damper 39 thus may take the hot gases as giving up some of their heat to the walls of the ducts 29 and throw such gases into the ,way 33 even with the damper 30 in the stack 31 opened. With the fan 34 in operation there is such induced draft in the way 33 that the damper 30 may be closed and sufficient draft provided for efficient operation of this furnace. For a still greater direct flow of the gases from the combustion chamber 27, ports 43 may be opened by slide valve 44 as operated by handle 45 and thus independently of the door 39 allow gases from the com-' bustion chamber 27 to flow directly into the way 33 for drying timber or other material.

In the operation hereunder the fan 34 is shown as having belt 46 driving ai'r compresser 47 for'maintaining air supply in tank 48, the pressure of which may be indicated by gauge 49. Duct 50 from this tank 48 extends to thermostat 51 in hot air supply way 35 which is effective through lever 52 and chains 53, 54, for controlling the draft to the furnace below the grates or fire pot 8. This action is such that when the thermometer 55, as

checking the thermostat 51, indicates that there is rise in teinperaturebeyond that desired in practice, the draft may be checked automatically. 5 Between the fan ,34, as continuously driven during the operation hereunder, and this'hot air supply way or duct 35 to the drying apparatus 36, is disposed a safety device precluding passing of high temperature fumes or products of combustion into the drier 36 when the fan 34 is not in operation. This safety device as herein shown comprises-a louvre having vanes 56 normally closed by gravity. However, as the fan 34 is started suflicient pressure is maintained to open these louvres and thereby direct the supply of hot gases into the supply way 35. As the fan 34 is stopped the louvres 56 at once close. L s a No dust from the material in the drier 36 may come back ,into this fan 34 and have connection with the furnace for promoting spontaneous. combustion. Accordingly, as to communication either-way, and any danger inciopenings extending upwardly thereabout, a

sec dary sectional fire pot rising from the primary fire pot, a furnace/housing, and duct sections extending through the housing provided with sustaining connection means for said secondary fire pot sections.

2. A furnace comprising a grate, asectional fire pot extendin upwardly therefrom, a furnace housing, an duct sections extending through the housing having upwardly projecting seats astride which said fire pot sections are mounted.

3. A furnace comprising a grate, an annular series of fire pot sections extending upwardly therefrom, said sections downwardly terminating in grooved seats, a furnace housing, a d horizontally extending box-shaped duct sections extending through the housing having upwardly projecting tongues for entering said fire pot section grooves.

4. A furnace comprising a grate, an annular series of fire pot sections extending upwardly therefrom, said sections downwardly terminating in grooved seats, a furnace housing, horiiontally extending box-shaped duct sections-extending through the housing having upwardly projecting tongues-for entering said fire pot section grooves, said fire pot section having additional seats extending upwardly from said grooved seats, and headed means anchored in said housing for coacting with the additional seats as the grooved seats coact with the tongues, said fire pot sections being independently vertical'shiftable for placing and removal.

5. A furnace comprising a grate, a fire pot extending upwardly from said grate, a furnace housing, horlzontally extending boxshaped duct sections extending through said housing, said sections providing mounting means for the fire pot with clearance as to the housing, said box-shaped ducts forming air passage from exterior of the furnace extending to pass upwardly about saidfire 0t,

and damper means in said box-shaped uct sections operable by draft in permitting air supply into the furnace about said fire pot.

' In witness whereof I aifix my signature. OLIVER W. RANDOLPH. 

